Which of the following disaccharides gives two same monosaccharide units on hydrolysis ?

Options

A. Maltose
B. Sucrose
C. Lactose
D. Lactulose

Answer

To determine which disaccharide gives two identical monosaccharide units upon hydrolysis, we need to analyze the common disaccharides and their hydrolysis products.

### Step-by-Step Solution:

1. **Identify Common Disaccharides**: The common disaccharides are sucrose, lactose, and maltose.

2. **Understand Hydrolysis**: Hydrolysis is a chemical reaction that involves the breaking of a bond in a molecule using water. In the case of disaccharides, hydrolysis will break them down into their constituent monosaccharides.

3. **Analyze Each Disaccharide**:
- **Sucrose**: When sucrose is hydrolyzed, it breaks down into glucose and fructose. Thus, it gives two different monosaccharide units.
- **Lactose**: When lactose is hydrolyzed, it breaks down into glucose and galactose. Again, it gives two different monosaccharide units.
- **Maltose**: When maltose is hydrolyzed, it breaks down into two molecules of glucose. Thus, it gives two identical monosaccharide units.

4. **Conclusion**: Among the options, maltose is the disaccharide that gives two same monosaccharide units (glucose) upon hydrolysis.

### Final Answer:
Maltose is the disaccharide that gives two identical monosaccharide units (glucose) on hydrolysis.

---